package com.platform.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.Map;

/**
 * Created by zhouhaisheng on 2018/12/18.
 */
public class UrlUtilA {

  /**
   * 向指定 URL 发送POST方法的请求
   *
   * @param url 发送请求的 URL
   * @param param 请求参数
   * @return 所代表远程资源的响应结果
   */
  public static String sendPost(String url, Map<String, ?> paramMap) {
    PrintWriter out = null;
    BufferedReader in = null;
    String result = "";

    String param = "";
    Iterator<String> it = paramMap.keySet().iterator();

    while (it.hasNext()) {
      String key = it.next();
      param += key + "=" + paramMap.get(key) + "&";
    }

    try {
      URL realUrl = new URL(url);
      // 打开和URL之间的连接
      URLConnection conn = realUrl.openConnection();
      // 设置通用的请求属性
      conn.setRequestProperty("accept", "*/*");
      conn.setRequestProperty("connection", "Keep-Alive");
      conn.setRequestProperty("Accept-Charset", "utf-8");
      conn.setRequestProperty("user-agent",
          "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
      // 发送POST请求必须设置如下两行
      conn.setDoOutput(true);
      conn.setDoInput(true);
      // 获取URLConnection对象对应的输出流
      out = new PrintWriter(conn.getOutputStream());
      // 发送请求参数
      out.print(param);
      // flush输出流的缓冲
      out.flush();
      // 定义BufferedReader输入流来读取URL的响应
      in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
      String line;
      while ((line = in.readLine()) != null) {
        result += line;
      }
    } catch (Exception e) {
      System.out.println(e);
    }
    //使用finally块来关闭输出流、输入流
    finally {
      try {
        if (out != null) {
          out.close();
        }
        if (in != null) {
          in.close();
        }
      } catch (IOException ex) {
        ex.printStackTrace();
      }
    }
    return result;
  }
}
